The name of the flag depends on the manufacturer (Intel, AMD) and is
settable in BIOS.
But I think you do not have CPU with support of virtualisation and amount
of memory you have is too small even for VMware Player

It could be the type of cpu you have and the type of cpu that is needed to
run
vmware. How old is the cpu? PC? Is the cpu a core 2 duo? Quadcore? Xeon?
With vmware 9, there are certain hardware requirements, and its my guess
that
the type of cpu you have does not fit the needed requirements to run vmware.

Unfortunately, it is a little more than just upgrading the CPU. To go from a 32 bit processor to one that is 64 bit capable usually requires an upgrade to the chipset which means a motherboard upgrade as well.

I just trying to wrap my head around installing a VM on a single core 1.13 Ghz, 256 MB, XP box. Perhaps DSL Linux with no GUI would be ok. Anything with a GUI would be almost impossible slow and cumbersome.

Install a Linux OS and VMware, then install your XP in the VM
environment. I run Linux Mint 13xfce with Virtual Box and installed my
Windows XP Home Edition in Virtual Box, works well except that once i
activated the USB ports in XP, the graphic controller defaulted to
600x800 and doesn't allow me to go higher so there is currently a
trade-off in having the usb ports available to the XP virtual box. I
rarely use the Windows os though.

You need to upgrade entire computer. The absolute minimum for contemporary
desktop virtualisation (virtual machines at desktop) are 2 GB RAM, and good
mount of diskspace plus processor, which support virtualisation.

The first thing you must consider is the real world affects of Moore's Law. Both hardware and software is improving at an increasing pace and any manufacturer of either would be foolish to linger on dated technology. Failing to incorporate a scheduled replacement of dated hardware and software into your business plan will leave you constantly searching for obsolete parts that are more expensive than their newer counterparts. A motherboard is the foundation of the computer system and must be considered every time a bigger and better software tool is released because that is the platform it was designed to run on. For whatever it is worth, change is a constant in the computer world and embracing that change is your job if you want to remain in it.

Linux generally runs easily on minimal resources, VM software however
requires more robust hardware for it to be useable or in many cases even
installable. Someone else mentioned needing at least 2GB RAM, I agree,
really more. I tried to run VirtualBox in Linux Ubuntu 11.04 on a Dell
Dimension 2400 with a single core 2.4Ghz cpu, 2GB RAM, VBox installed
without issue but WindowsXP Home and other Linux OS instances installed
in it were unusable, they were all so sluggish it was useless. I since
bought a new PC with plenty of CPU and RAM power and run WindowsXP Home
Edition in Virtual Box on a Linux Mint 13 xfce OS flawlessly. The old
Dell 2400 is dual booting with Windows XP and Linux Ubuntu 11.04, Linux
runs much better on it than Windows but I'm no longer running any
virtual software on it. I plan to convert it to a Linux server.

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